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Income Taxes - Reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation between provision for income taxes and pre-tax income      
Consolidated net income $ 8,299 $ 6,206 $ 4,786
Provision for income taxes 3,029 970 1,653
Pre-tax income $ 11,328 $ 7,176 $ 6,439
French statutory tax rate (as a percent) 44.43% 34.43% 38.00%
Theoretical tax charge $ (5,033) $ (2,471) $ (2,447)
Difference between French and foreign income tax rates (633) 5 (6)
Tax effect on equity in income (loss) of affiliates 888 761 897
Permanent differences 1,491 (76) (371)
Adjustments on prior years income taxes (91) 54 100
Adjustments on deferred tax related to changes in tax rates (309) 234 483
Changes in valuation allowance of deferred tax assets 658 523 (309)
Total income taxes $ (3,029) $ (970) $ (1,653)
Standard corporate tax rate (as a percent) 33.33% 33.33% 33.33%